Wrong Planchet – Coins struck on planchets which were not intended for that denomination and are small enough to fit into the striking chamber for a larger coin. The planchets get left in the hopper when the machines dies are switched for another coin. Examples include a cent on dime planchet, quarter on nickel or dime, half dollar on cent or quarter.

nickel on cent planchet

Cent on dime planchet

Quarter on Nickel planchet

Indian Head Cent on 3 Cent Nickel Planchet